<!DOCTYPE HTML>
<html>
<body>
<div style="overflow:auto; width:300px; height:300px; background:green;">
  <div style="height:100px;"></div>
  <div style="height:200px; margin-left:100px; margin-right:100px; width:100px; background:yellow;"></div>
  <div style="height:100px;"></div>
</div>
</body>
</html>
